Question

我想通过像这样的循环来制作偶数和奇数

these are even 2,4,6,8,10
these are odd 1,3,5,7,9

我尝试使用for循环：

<?php

    $end=50;
    $even= "Even Numbers Are : ";
    $odd="<br /> Odd Numbers Are : ";

    for($i=1;$i<=$end;$i++)
    {
        if($i%2==0)
        {
            $even.=$i.",";
        }else $odd.=$i.","; 
    }   
    echo $even.$odd;

?>

Answer 1

这是启动变量的方法：

$i = 0;

这是如何增加变量+ 1：

$i = $i + 1;

// or simply

$i++;

这就是while()循环的工作原理：

while([expression here is true]) {
   // do stuff
}

有了这些知识，你可以尝试自己做功课。

文档：

http://php.net/manual/en/control-structures.while.php

Answer 2

有点迟到了，但我很高兴，无论如何都要写它

<?php
             $i=0;
             while($i <= 10){
                 if($i % 2 == 0){
                     echo $i." - Even,  ";
                 }else{
                      echo $i." - Odd,  ";
                 }
                 $i++;
             }
   ?>

此外，在for循环中，您还没有打开else，但是您正在关闭它。

Answer 3

 class IsOdd
   {

   public function __construct($x) {
    if ($x % 2 != 0) {
     echo "this odd number";
    } else {
     echo "this even number";
    }

   }

   }

  $odd = new IsOdd(5);
//output
this even number

Answer 4

    <?php
echo"Ashutosh Verma Branch_IT_9889313834";
echo"<br />";
echo "Even No between 1 to 30 are:--";
echo"<br />";
for ($x=1; $x<=30; $x++)
{
    if( $x%2==0)
    {
    echo $x.", ";
    }
}
echo "<br />";
echo "Odd No between 1 to 30 are:--";
echo"<br />";
for ($x=1; $x<=30; $x++)
{
    if( $x%2!=0)
    {
    echo $x.", ";
    }
}
?>
---------------------------------------OOTPUT-------------------------------------
Ashutosh Verma Branch_IT_9889313834
Even No between 1 to 30 are:--
2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 
Odd No between 1 to 30 are:--
1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29,

在php中循环的偶数和奇数

4 个答案: